Answer:
f(-7) = -5
Step-by-step explanation:
We want to find what f(x), or y is, when x is equal to -7.
f(x)=2x+9
Therefore, we can substitute -7 in for x.
f(-7)=2(-7)+9
Now, solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition and Subtraction.
Multiply 2 and -7 first.
f(-7)= -14+9
Add -14 and 9
f(-7)=-5
